======================================================== WARNING: possible irq lock inversion dependency detected 5.18.0-rc3-syzkaller-00007-g559089e0a93d #0 Not tainted -------------------------------------------------------- kworker/u4:13/3857 just changed the state of lock: ffff88814bab7110 (&group->lock){..-.}-{2:2}, at: snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848 but this lock took another, SOFTIRQ-READ-unsafe lock in the past: (tasklist_lock){.+.+}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &group->lock --> &timer->lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&group->lock); lock(&timer->lock); lock(&group->lock); *** DEADLOCK *** 2 locks held by kworker/u4:13/3857: #0: ffff88814bd97138 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc900046a7d00 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 the shortest dependencies between 2nd lock and 1st lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1508 kernel_wait+0xe4/0x230 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 SOFTIRQ-ON-R at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1508 kernel_wait+0xe4/0x230 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 INITIAL USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326 copy_process+0x234d/0x3f70 kernel/fork.c:2368 kernel_clone+0x22f/0x7a0 kernel/fork.c:2639 kernel_thread+0x167/0x1e0 kernel/fork.c:2691 rest_init+0x21/0x2e0 init/main.c:691 start_kernel+0x4bf/0x56e init/main.c:1140 secondary_startup_64_no_verify+0xc4/0xcb INITIAL READ USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x224/0x9d0 kernel/exit.c:1508 kernel_wait+0xe4/0x230 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xbe/0x300 fs/fcntl.c:792 kill_fasync_rcu fs/fcntl.c:1003 [inline] kill_fasync+0x1e4/0x430 fs/fcntl.c:1017 lease_break_callback+0x22/0x30 fs/locks.c:507 __break_lease+0xe32/0x1980 fs/locks.c:1480 break_lease include/linux/fs.h:2506 [inline] do_dentry_open+0x6ea/0xfd0 fs/open.c:815 do_open fs/namei.c:3476 [inline] path_openat+0x26c0/0x2ec0 fs/namei.c:3609 do_filp_open+0x277/0x4f0 fs/namei.c:3636 do_sys_openat2+0x13b/0x500 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_creat fs/open.c:1305 [inline] __se_sys_creat fs/open.c:1299 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1299 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&f->f_owner.lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326 f_modown+0x38/0x340 fs/fcntl.c:91 __f_setown fs/fcntl.c:110 [inline] f_setown_ex fs/fcntl.c:200 [inline] do_fcntl+0x108c/0x13b0 fs/fcntl.c:383 __do_sys_fcntl fs/fcntl.c:454 [inline] __se_sys_fcntl+0xd5/0x1b0 fs/fcntl.c:439 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL READ USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x300 fs/fcntl.c:778 kill_fasync_rcu fs/fcntl.c:1003 [inline] kill_fasync+0x1e4/0x430 fs/fcntl.c:1017 lease_break_callback+0x22/0x30 fs/locks.c:507 __break_lease+0xe32/0x1980 fs/locks.c:1480 break_lease include/linux/fs.h:2506 [inline] do_dentry_open+0x6ea/0xfd0 fs/open.c:815 do_open fs/namei.c:3476 [inline] path_openat+0x26c0/0x2ec0 fs/namei.c:3609 do_filp_open+0x277/0x4f0 fs/namei.c:3636 do_sys_openat2+0x13b/0x500 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_creat fs/open.c:1305 [inline] __se_sys_creat fs/open.c:1299 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1299 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] __alloc_file.__key+0x0/0x10 ... acquired at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x300 fs/fcntl.c:778 kill_fasync_rcu fs/fcntl.c:1003 [inline] kill_fasync+0x1e4/0x430 fs/fcntl.c:1017 lease_break_callback+0x22/0x30 fs/locks.c:507 __break_lease+0xe32/0x1980 fs/locks.c:1480 break_lease include/linux/fs.h:2506 [inline] do_dentry_open+0x6ea/0xfd0 fs/open.c:815 do_open fs/namei.c:3476 [inline] path_openat+0x26c0/0x2ec0 fs/namei.c:3609 do_filp_open+0x277/0x4f0 fs/namei.c:3636 do_sys_openat2+0x13b/0x500 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_creat fs/open.c:1305 [inline] __se_sys_creat fs/open.c:1299 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1299 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326 fasync_remove_entry+0xff/0x1d0 fs/fcntl.c:873 lease_modify+0x4dd/0x6a0 fs/locks.c:1345 locks_remove_lease fs/locks.c:2588 [inline] locks_remove_file+0x52e/0xfd0 fs/locks.c:2613 __fput+0x325/0x820 fs/file_table.c:309 task_work_run+0x146/0x1c0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL READ USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:996 [inline] kill_fasync+0x13b/0x430 fs/fcntl.c:1017 lease_break_callback+0x22/0x30 fs/locks.c:507 __break_lease+0xe32/0x1980 fs/locks.c:1480 break_lease include/linux/fs.h:2506 [inline] do_dentry_open+0x6ea/0xfd0 fs/open.c:815 do_open fs/namei.c:3476 [inline] path_openat+0x26c0/0x2ec0 fs/namei.c:3609 do_filp_open+0x277/0x4f0 fs/namei.c:3636 do_sys_openat2+0x13b/0x500 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_creat fs/open.c:1305 [inline] __se_sys_creat fs/open.c:1299 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1299 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] fasync_insert_entry.__key+0x0/0x20 ... acquired at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:996 [inline] kill_fasync+0x13b/0x430 fs/fcntl.c:1017 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386 snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516 snd_timer_start1+0x53d/0x640 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_user_start sound/core/timer.c:1984 [inline] __snd_timer_user_ioctl+0xae7/0x54c0 sound/core/timer.c:2107 snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&timer->lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:374 [inline] snd_timer_close_locked+0x58/0x8e0 sound/core/timer.c:396 snd_timer_close sound/core/timer.c:463 [inline] snd_timer_user_release+0x125/0x290 sound/core/timer.c:1520 __fput+0x3b9/0x820 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] snd_timer_new.__key+0x0/0x20 ... acquired at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_timer_notify+0x105/0x3e0 sound/core/timer.c:1086 snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline] snd_pcm_post_stop sound/core/pcm_native.c:1512 [inline] snd_pcm_action sound/core/pcm_native.c:1364 [inline] snd_pcm_stop+0x3b8/0x4c0 sound/core/pcm_native.c:1535 snd_pcm_drop+0x431/0x580 sound/core/pcm_native.c:2218 snd_pcm_oss_sync+0x254/0xf00 sound/core/oss/pcm_oss.c:1746 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2590 __fput+0x3b9/0x820 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&group->lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x1a1/0x580 kernel/time/hrtimer.c:1766 __do_softirq+0x382/0x793 kernel/softirq.c:558 do_softirq+0x161/0x240 kernel/softirq.c:459 __local_bh_enable_ip+0x1b0/0x1f0 kernel/softirq.c:383 spin_unlock_bh include/linux/spinlock.h:394 [inline] batadv_nc_purge_paths+0x35f/0x3f0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x31e/0x5b0 net/batman-adv/network-coding.c:722 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 INITIAL USE at: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:374 [inline] snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline] snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline] snd_pcm_hw_params+0x164/0x1860 sound/core/pcm_native.c:726 snd_pcm_oss_change_params_locked+0x1f21/0x3c80 sound/core/oss/pcm_oss.c:976 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1116 [inline] snd_pcm_oss_make_ready sound/core/oss/pcm_oss.c:1175 [inline] snd_pcm_oss_sync+0x5ce/0xf00 sound/core/oss/pcm_oss.c:1675 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2590 __fput+0x3b9/0x820 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] snd_pcm_group_init.__key+0x0/0x20 ... acquired at: mark_lock+0x21c/0x350 kernel/locking/lockdep.c:4607 __lock_acquire+0xb81/0x1f80 kernel/locking/lockdep.c:4983 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x1a1/0x580 kernel/time/hrtimer.c:1766 __do_softirq+0x382/0x793 kernel/softirq.c:558 do_softirq+0x161/0x240 kernel/softirq.c:459 __local_bh_enable_ip+0x1b0/0x1f0 kernel/softirq.c:383 spin_unlock_bh include/linux/spinlock.h:394 [inline] batadv_nc_purge_paths+0x35f/0x3f0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x31e/0x5b0 net/batman-adv/network-coding.c:722 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 stack backtrace: CPU: 0 PID: 3857 Comm: kworker/u4:13 Not tainted 5.18.0-rc3-syzkaller-00007-g559089e0a93d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_irq_inversion_bug+0x58c/0x6f0 kernel/locking/lockdep.c:4014 mark_lock_irq+0x9d2/0xf00 kernel/locking/lockdep.c:4177 mark_lock+0x21c/0x350 kernel/locking/lockdep.c:4607 __lock_acquire+0xb81/0x1f80 kernel/locking/lockdep.c:4983 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x1a1/0x580 kernel/time/hrtimer.c:1766 __do_softirq+0x382/0x793 kernel/softirq.c:558 do_softirq+0x161/0x240 kernel/softirq.c:459 __local_bh_enable_ip+0x1b0/0x1f0 kernel/softirq.c:383 spin_unlock_bh include/linux/spinlock.h:394 [inline] batadv_nc_purge_paths+0x35f/0x3f0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x31e/0x5b0 net/batman-adv/network-coding.c:722 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30